Code Definition

P047B — Exhaust pressure sensor signal out of range sensor 2

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P047B

P047B is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P047B is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P047B is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P047B is activated when the Engine Control Module (ECM) identifies that the signal from the second exhaust pressure sensor is outside the expected range. This situation implies that the sensor's signal does not align with the ECM's anticipated values, given the current operating conditions of the engine and exhaust system. The exhaust pressure sensor 2 is essential for monitoring the exhaust back pressure, which is crucial for effective engine management, emissions control, and diagnosing exhaust-related issues.

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